defmodule Mix.Tasks.GenPost do
  @moduledoc "gen_post: Generate a new blog post."
  @shortdoc "Generates a new blog post. Takes the title, and generates the rest."

  use Mix.Task

  @impl Mix.Task
  def run([title]) do
    dir = Application.app_dir(:jol, "priv/posts/blog/")

    slug = title
           |> String.downcase()
           |> String.replace(" ", "-")
           |> String.replace(~r/[^a-zA-Z0-9 -]/, "")

    pubdate = DateTime.now!("America/New_York")
    filename = "#{slug}.md"
    filepath = "#{dir}/#{filename}"

    if File.exists?(filepath) do
      IO.puts(:stderr, "Already exists: priv/posts/blog/#{filename}")
      IO.puts(:stderr, "Stop reusing blog titles!")
    else
      content = """
      +++
      slug = "#{slug}"
      title = "#{title}"
      date = #{DateTime.to_iso8601(pubdate)}
      draft = false

      [taxonomies]
      # An array of quoted strings
      tags = []
      +++

      """
      File.write(filepath, content)
      IO.puts "Created: #{dir}#{filename}"
    end
  end
end